Pain relievers, ciclosporin, levodopa, pergolide, anticholinergics, lithium, mexiletine, atovaquone, digoxin, bromocriptine, cimetidine, CNS depressants, antiepileptics, apomorphine, antipsychotics, opioids, tetrabenazine, MAOIs, furazolidone, procarbazine, alcohol.